Question 1 Solution
Tossing at least one head means tossing no tails.
Probability of tossing tails 3 times in a row is 1/2 x 1/2 x 1/2 = 1/8
Probability of not tossing tails 3 times in a row i.e. tossing at least one head is 1 - 1/8 = 7/8
D
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